The correct answer to this question is C. Since Pres. Carter was very much involved in trying to create peace in the Middle East, D is put there to confuse you. The term "shuttle diplomacy" actually referred to earlier efforts by Kissinger to resolve conflicts in the wake of the Yom Kippur War in 1973.

Space exploration was used as a means to try to create better relations between the US and the Soviet Union. ...

The correct answer to this question is C. Since Pres. Carter was very much involved in trying to create peace in the Middle East, D is put there to confuse you. The term "shuttle diplomacy" actually referred to earlier efforts by Kissinger to resolve conflicts in the wake of the Yom Kippur War in 1973.

Space exploration was used as a means to try to create better relations between the US and the Soviet Union. However, that was in the days before space shuttles and the term "shuttle diplomacy" was not used to refer to those programs.